a) at least 18
b) 2ab
c) 2(a + b)
d) (a + b) ≥ 10
Answer: d
Explanation: When two 2 digit numbers are added and the resultant value is a three digit number. It means there must be a carry over (i.e. The sum of unit digits be greater than 9. Similarly, the sum of the tens digit is also greater than 9)
Required numbers = 64 + 46 = 110
So, Option ‘d’ is correct.
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